import java.text.SimpleDateFormat;
import java.util.Date;
public class timetool {
private static final SimpleDateFormat fmt = new SimpleDateFormat("HH:mm:ss:SSS");
public interface Task {
    void execute();
}
public  static void check(String title, Task task) {
    if (task == null)return;
    title = (title == null) ? "" : ("[" + title + "] ");
    System.out.println(title );
    System.out.println("开始："+fmt.format(new Date()));
    long begin = System.currentTimeMillis();
    task.execute();
    long end = System.currentTimeMillis();
    System.out.println("结束："+fmt.format(new Date()));
    double delta = (end - begin) / 1000.0;
    System.out.println("耗时："+delta+"秒");
    System.out.println("-------------------------------------");
}
}
